The general pattern for b-movie horror movie trilogies is, to my mind, a relatively established, disappointing and inevitable one. The first film is a success, frequently because the people involved in making it are new to the business or coming in as outsiders so don’t know/care about the preconceived notions of “how to do it right” (Evil Dead, Ginger Snaps, Night Of The Living Dead). The second, often not planned when the first was made and often with a bigger budget, is often made soon after as an attempt to cash in on the success of the first by building on whatever part of the mythos or scares stuck with the audience the most (Friday The 13th Part 2, Hellbound, Evil Dead 2). The third part is normally where the wheels come well and truly off the bus in spectacular fashion, as the core talent moves on (Halloween 3), the budget falls away as the makers realise the core audience will buy anything with its name on it (Wishmaster 3), or it shifts into a new direction (Army Of Darkness).
Benny and Joon is a 1993 feelgood romantic comedy/promotional vehicle for the acting talents of the then rising star Johnny Depp, about the lighthearted and loving moments of living with nondescript and nonthreatening mental illness. No, don’t run away! It’s all very well intended and far to homely to cause outright offence; it’s simply “of its time” trying-to-be-considerate offensive and a lightweight take on a heavyweight issue. That makes it better, right??